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The Effect Of Mass OfDifferent Objects On The Buoyant ForceNorhafiza Bt Haron D20101037425Nor Fariha Bt Abu Bakar D20101037427Aini Mohamad D20101037431
ENGAGE • What is buoyant force? • How buoyant force determine whether an object sinks or floats on water? • Is there any different if the boat is floating on fresh water and salt water. • What factors that influence buoyant force? • What principle related to buoyant force?
Planning and doing experimentTitle : The effect of mass of different objects on the buoyant force. Objective :1. Use a Force Sensor to measure the weights of objects in and out of water2. Determine the weight of water displaced by each of the objects 3. Determine the relationship of depth of the immersed object to the buoyant force.
Hypothesis: The magnitude of the buoyant force is directly proportional to the weight of the fluid that the object displaces.Magnitude of buoyant force FB = Wfluid Weight of displaced fluid
PROCEDURES 1. SET UP THE COMPUTER AND THE FORCE SENSOR 2. SET UP THE APPARATUS AS BELOW: 800mL Lab jack3. CALCULATE THE DIAMETER, RADIUS AND AREA OF THE ALUMINIUM CYLINDER
4.CLICK ‘START’ BUTTON OF THE SENSOR AND IMMERSE THE OBJECT WITH THE DIFFERENT DEPTHS BY RAISING THE BEAKER WITH THE LAB JACK 5. WAIT FOR THE BUOYANT FORCE READING IN THE DISPLAY 6. DRAW THE BUOYANT FORCE AGAINST THE DEPTH OF THE IMMERSED OBJECT7. REPEAT THE PROCEDURE BY DIFFERENT OBJECTS ( BRASS AND COPPER)
Results: Aluminium Brass CopperActual mass of 26.16 111.39 102.65sample (g)Diameter of sample 1.88 1.88 1.88(g)Sample height (cm) 3.45 4.29 4.49Density (ρ) H20 1.00 1.00 1.00(g/cm3)Apparent mass in 15.25 89.26 97.30H20 (g)
Calculation Aluminium Brass CopperActual weight of 25654.07 100664.75 109235.72sample (cm/s2)Density of sample 2.78 8.78 9.13(g/cm3)Area of sample 2.78 2.78 2.78(cm2)Volume of cylinder 9.58 11.91 12.46(cm3)Displaced liquid 9.43 11.70 12.20volume= Fb
Questions:1. Why was the Force Sensor zeroed after the cylinder was attached to the hook?2. What is the effects of mass of sample to the buoyant force?3. In that experiment, what is the object that give the lowest and highest buoyant force?
Conclusion:As conclusion, an object that floats displaces the amount of water that has the same weight as the object. If it sinks, it displaces an amount of water that has less weight than the object.
ENHANCE- Floating and Sinking- Buoyancy control can maintain their position with very little effort- Good Buoyancy proper weighting ( effect the diver position)- Dive injury ex. Barotraumas- Rapid ascent
EXTENSION • The application of buoyancy can be applied to staying afloat on the water. • Fish, human swimmers, icebergs, and ships. • Eg:Fish - Application of volume changes as a means of altering buoyancy. - Have interesting swim bladder, which fill with gas. - Rise/descent, changes the volume in swim bladder, which changes its density. • Eg: swimmer - Different swimming in fresh water and salt water. - Buoyant depend on density of fluid. - Eg: Dead Sea (the saltiest water on Earth)
UNIQUE FEATURE OF THIS EXPERIMENT• Buoyancy is defined as the tendency of a fluid to exert a supporting upward force on a body placed in the fluid.• Buoyant force must equal to the weight of the displaced fluid.• A solid object would float if the density of the solid object were less than the density of the fluid and vice versa.